NOISE SURVEY AND MEGGER TEST

Noise Survey: The acoustic noise in electric motors is a phenomenon of a complex nature and origin. The first kind, electromagnetic vibration and noise, is produced by magnetic forces, magnetostrictive expansion of the core laminations, eccentricity, phase unbalance, slot openings, and magnetic saturation. The second cause of noise is mechanical and is associated with mechanical assembly, in particular the bearings. The third major group is aerodynamic noise, which is due to the flow of ventilating air through or over the motor.One form of energy conversion happening in an electrical motor is from electrical energy to acoustic energy. The supply current interacts with the material to produce a magnetic field, which in turn produces magnetic forces. These forces excite the stator core and frame in the corresponding frequency range and produce mechanical vibrations. As a consequence of vibrations, the surface of the stator yoke and frame deforms with frequencies corresponding to the frequencies of forces. These stator
and frame vibrations cause the surrounding medium of air to excite and vibrate and finally generate acoustic pressure variations (and thereby noise).

Megget Test: The Megger test is a method of testing making use of an insulation tester resistance meter that will help to verify the condition of electrical insulation. The IR gives a measure of the enduring power of an insulator to bear the service voltage without any current leakage path.

Any service/ supply enquiry, email to info@oceanicmarinellc.com Or call/whatsaap 00971508283116

Undertaking of GMDSS Radio survey, VDR/SVDR APT, Magnetic compass calibration including service/repair of AIS, EPIRB, INMARSAT C, LRIT, MF / HF (SSB) RADIOS, NAVTEX, VHF RADIOS, SART, SSAS, WALKIE TALKIES (HAND HELD RADIOS), AUTOPILOTS, AZIMUTH CIRCLES, BNWAS, CHARTS & ITU PUBLICATIONS, COURSE RECORDER, ECDIS, ECHO SOUNDERS, ELECTRONIC CHARTS ( ENC) - AVCS & ARCS, GPS, GYRO COMPASS, MAGNETIC COMPASS, MAGNETRONS, RADAR, SPEED LOG, SVDR (SIMPLIFIED VOYAGE DATA RECORDER), WIND SPEED INDICATORS

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Major Marine brands – Furuno, JRC, Northrop Grumman Sperry, Simrad, Consilium, McMurdo, Transas, Anschutz, Yokogawa, Tokiyo Keiki, Sailor, Saab, Kelvin Hughes, Koden, Saracom, SRC, NCR, Danelec VDR, Samsung VDR, Totem plus VDR, Netwave VDR, Comnav, KVH, Jotron, GME, Vingtor, Skipper, Intellian, Highlander, Headway